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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The shoulder is a ball-and-socket joint that moves in many different directions. Shoulder flexion -- lifting the arm out in front of the body and up overhead -- is a movement used in many daily activities. There are several muscles that produce shoulder flexion.